Light commercial and residential RO storage composite pressure vessel. High strength precision molded internal liner reinforced with continuous strand fibreglass and sealed with high grade epoxy resin. Polypropylene lower water chamber with 100% butyl diaphragm. Lightweight, non-corrosive construction for maximum life and maximum flexibility. Tank Volume Height Diameter Connection Size Weight Drawdown 15 Gallon 25.6" 16.5" 1" NPT 19 9.3 Gallons Materials of Construction Shell: Chemically coupled polypropylene. Connection: Male socket, Rigid PVC. Water Chamber: 100% butyl diaphragm with polypropylene lower chamber. Ratings & Certifications Max. Working Pressure 125 PSI Max. Working Temperature 120 F WQA-NSF/ANSI 61 WQA-NSF/ANSI 372